2.5″ 3-Jaw Chucks – Various Thread

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2.5″ 4-Jaw Chucks – Various Thread
Includes 2 tommy bars, not pictured
This chuck combines the ease-of-use advantages of the 3-jaw chuck with some of the advantages of a 4-jaw chuck. It will automatically center square or round stock. (The stock must be accurately shaped for all four jaws to grip.) It will also grip thin-wall tubing in four places rather than three, which spreads out the load and allows more grip without crushing the tubing.
Turning the knurled portion of the outer diameter of the chuck scrolls all four jaws in unison. Included with the chuck are two Tommy bars for tightening and loosening the chuck.
Centering accuracy on self-centering chucks is to within a few thousandths of an inch. If perfect centering accuracy is required, see the section on 4-jaw independent jaw chucks.
This chuck will hold parts from 3/32" in diameter up to 1-3/16" with jaws in the normal position and up to 2-1/4" with the jaws reversed.
Chucks for Sherline and Other Lathes
The chuck is available in several spindle threads for use on Sherline (3/4-16) and other machines such as old Unimat lathes (12mm x 1mm and 14mm x 1mm). *Please note that chucks with a thread size other than 3/4" x 16 are made to order and have a lead time of 5-7 business days.
Jaw Options
• For those who have jobs where speed and ease of use are more important than maximum accuracy, and want a chuck that is loose right from the start (No extra charge). Add the note “loose jaws” to the comments box below
• Soft (not hardened or machined) steel jaws are also available when you build your own chuck.
From: $156.87 Select options This product has multiple variants. The options may be chosen on the product page


2.5″ 4-Jaw Independent Chucks – Various Thread
Includes hex key, not pictured
These chucks have four advantages over 3-jaw chucks.
1. They can be used to hold irregularly shaped parts
2. They can be used to center parts with a great deal of accuracy
3. 4-jaw chucks can be used to deliberately hold a part off-center
4. They can clamp stock tighter
This is a valuable asset when machining cams, crankshafts, and similar parts. The main disadvantage of the 4-jaw independent chuck is that the jaws must be set individually, adding considerable setup time. The jaws are reversible to accommodate larger stock.
NOTE: The independent chucks don't have Tommy bar holes like the scroll chucks because most people use the 5/32" hex wrench into one of the jaw screws to thread the chuck on and off. Our P/N 3020 5/32" Hex T-Driver works perfectly.
Like the Sherline 3-jaw chucks, the 4-jaw chucks can clamp either externally or internally. Although we recommend the 3-jaw chuck for standard lathe projects, the 4-jaw chuck is considered the accessory that could add the most versatility to your machine. If you feel the 4-jaw chuck would be more useful, and you have no need for the 3-jaw chuck, any lathe “A” package can be ordered with the 4-jaw chuck substituted for the 3-jaw upon request. A clamping groove allows the chuck to hold parts for milling.
Chucks for Sherline and Other Lathes
The chuck is available in several spindle threads for use on Sherline (3/4-16) and other machines, such as old Unimat lathes (12 mm x 1 mm and 14 mm x 1 mm)  or Sears 6" lathes (1/2-20). *Please note that chucks with a thread size other than 3/4″ x 16 are made to order and have a lead time of 5-7 business days.
Jaw Options
• For those who have jobs where speed and ease of use are more important than maximum accuracy and want a chuck that is loose right from the start (No extra charge). Add the note “loose jaws” to the comments box below
• Soft (not hardened or machined) steel jaws are also available when you build your own chuck.
From: $132.73 Select options This product has multiple variants. The options may be chosen on the product page


3.1″ 3-Jaw Chuck – Electroless Nickel Coated
This chuck is identical to P/N 1040 except for an electroless Nickel coating that has been applied to help prevent wear and corrosion. This special coating has been applied to all external and internal surfaces of the chuck (except for chuck jaws), significantly improving the life of the chuck. This chuck also opens and closes more smoothly due to the lubrication properties of Nickel-Teflon.
• Ductile plating with columnar structure
• Harder than any other nickel-based coating
• Coating uniformity that eliminates post-plate grinding (or burnishing)
• Wear properties overall superior to hard chromium
• Hardness (68-72 Rc)
• Low coefficient of friction (.044) Teflon™ is .04
• Uniform coating thickness up to .004”
• Accepts dry film lubricants
Jaw Options
• For those who have jobs where speed and ease of use are more important than maximum accuracy and want a chuck that is loose right from the start (No extra charge). Add the note “loose jaws” to the comments box below
• Soft (not hardened or machined) steel jaws are also available when you build your own chuck.
  How to Distinguish between Standard Chucks and Coated Chucks
Some of our customers have been wondering how to tell the difference between our standard chucks and those that have the electroless Nickel coating. Standard chucks have darker markings than the coated chucks (See Figure 1. Click on photo to view a larger image).
[caption id="attachment_4231" align="aligncenter" width="300"] Figure 1—Examples: (Left) 1040 3-Jaw Chuck (3.1″), (Right) 1040C Electroless Nickel Coated 3-Jaw Chuck (3.1″).[/caption]  
Here, at Sherline Products, each of our chucks is laser engraved with a company mark, chuck size, and jaw location. During the laser marking process the laser removes a bit of the surface and darkens the material below (Figure 1, left). When chucks are sent out to receive the Nickel-Teflon finish the coating process changes the dark engraved markings to a noticeably lighter finish (Figure 1, right).
There is also a subtle change in the color of the chuck, but in the absence of being able to compare them side by side, the most evident way to tell whether you have a coated chuck, or not, is to check the color of the laser markings.
$210.59 Add to cart


Build Your Own Chuck
You can custom-build your own 3 or 4-jaw chuck. Choose from 2.5" or 3.1" body size and a variety of jaw options. For more information and technical specifications of the chucks or jaws themselves, please see their individual pages below
3-Jaw Self-Centering chucks 4-Jaw Self-Centering chucks 4-Jaw Independent chucks Various chuck jaws
Lead time for custom-built chucks is 4-5 business days.
$164.34 – $515.07Price range: $164.34 through $515.07 Select options